Overview
- France Nature Environnement presented results from samples collected in March–April 2025 by a France 5 team and analyzed by NIVA and EPFL across lake water, sediments, tap water, air and urine.
- Analyses detected diphenylguanidine (DPG) in all lake-water samples, traces of 6PPD and elevated 6PPD‑Q, with some samples containing up to 12 tire additives.
- About one-third of tested volunteers showed tire-derived compounds in urine, small amounts were found in drinking water, and airborne particles matched levels seen in major French cities.
- Investigators cite runoff from roads bordering roughly 40 km of highway with about 25,000 vehicles per day and the absence of stormwater filtration as key transport pathways into the lake that supplies 73% of local drinking water.
- Annecy’s mayor welcomed the investigation and requested additional studies and a dedicated monitoring committee modeled on the region’s PFAS oversight structure.